Insert 1 wooden stick into each apple.,In a heavy saucepan, combine the butter, brown sugar, corn syrup and milk; bring to a boil over medium-high heat.,Cook and stir until a candy thermometer reads 248 degrees (firm ball stage) about 30-40 minutes and for a softer caramel cook just to a few less degrees.,Remove from heat; stir in vanilla.,Dip each apple into hot caramel mixture; turn to coat.,Holding by the stick, sprinkle with nuts or whatever you desire while the caramel is still warm (work quickly the caramel sets up fast).,______,Note: if making a double recipe make two recipes in two separate pots.